Process for dyeing animal fibers



Patented Mar. 30, 1937 UNITED T S mm' orncs PROCESS FOR BEING ANIMAL AND COMPOSITION mm F0 SAID PURPOSE Fritz Straub, Fritz Grcther, and Charles Graenaohcr, Basel. Switzerland, allignora to the firm of Society of Chemical Industry in Basic,

Basel, Switzerland No Drawin Application June 'I, 1084. Serial No.

729,518. In Switzerland June 9, 1933 7 Claim.

This invention is an improvement in or a modification of that described in application Serial No. 718,083 filed March 29, 1934.

There is known a series of lyophlle unsulionated dispersing agents characterized on the one hand by containing in the same cation at least one basic nitrogen atom and at least one aliphatic radical consisting of at least 8 carbon atoms, the term aliphatic radical comprising both open and cyclic chains, such as inter alia decyl, dodecyl, heptadecyl radicals, or the radicals which correspond to the naphthene hydrocarbons, and on the other hand by their tendency to combine with dyestufis containing sulfo-groups.

Such products are, for example, the trimethylammonium sulfomethylate oi mono-steamy]- para-phenylenediamine oi the formula CH; l/oHg l CHa SOICHI (cf. German Patent No. 559,500, Example 10) the trimethylammoniumsulfomethylate of mono- OHa-(CHahrC 0-NH J oleyl-para-phenylenediamine, the trimethylammoniumsulfomethylate oi mono-stearoylethylenediamine, the trimethylammoniumsuliomethylate of mono-oleylethylenediamine of the formula the hydrochloride of diethylcetylamine of the formula CrHl C :(C a)i4CH:- C:Hr

(cf.. Reychler, Chemisches Zentralblatt published by the Deutsche Chemische Gesellschait,

1913, II, page 1377, line 2) the dimethyloctodecylaminehydrochloride or the formula CHa-(CHzht-CHz- CH3 o1 the sulfomethylate of octodecyltrimethylammonium, the hydrochloride of pentadecyldihydroimidazole, the cetylpyridinium chlorideor bromide; further the unsulionated cyclic amidines,

the stearylcholine hydrochloride and the corresponding benzyl compound, the palmitic acid ester or l-hydroxyphenyl-3-trimethylammonium chloride oi. the formula C I OH: 1/

Jjcm 1 CHa-(Olidu-OO-O the stearic acid ester of hydroxyethylpyridinium chloride of the formula OHr-(CH9iPOO-OOH:CHr Cl the hydrochloride or diethylaminoethyloctodecylcarbonate, the stearic acid ester of the addition product of slycerine-mono-chlorhydrin oi the formula or of oz, a'-glycerinedichlorhydrin and pyridine or the like. In all these compounds the stearic acid radical and the palmitic acid radical may be exchanged for other acid radicals, for instance that of oleic acid, capric acid, lauric acid, myristic acid or ricinoleic acid. Furthermore, the alcoholic radical, such as that of cetyl, alcohol, may be replaced by the radical of the alcohol corresponding with one or other of the aforesaid acids, such 25 No. 300 of the said Farbstofitabellen.

as the oleyl alcohol. Finally, derivatives of complex amines may be used, such as derivatives of diethylenetriamine, triethylenetetramine or the like. All these products neither contain suitegroups nor carboxyi-groups, but in the form of the salts which they form with acids, due to the presence of the basic N-atom, they are lyophile. If they are quaternary ammonium compounds. they may be lyophile also in the form of the free bases.

. These products render excellent service in dyebaths working with such dyestufis which are being dyed in the presence of acetic acid, which deflnition means dyestuifswhich may be (tied in an acetic acid bath as well as dyestuffs in the dyeing of which the acetic acid is used in the form of ammonium acetate which, as is known, splits off acetic acid in hot dye-baths due to the hydrolysis (of. the dyeing of dyestufis of the type of the dyestufl No. 552 of Schultz, Farbstofftabellen, 7th edition, 1931), and also dyestufi's which are first dyed in an acetic acid bath and to which sulfuric acid is added in the course or at the end of the dyeing process, as is the case for example in the dyestuif All these dyestuilfs have the common feature that they are dyed at the beginning preferably in an acetic acid bath, the acidity of which may vary within wide limits. However, if these dispersing agents are used in such proportion as is usual for textile assistants, that is to say in proportions of 1-10 per cent. of the goods to be dyed, there are obtained useless, and in many cases, directly injurious results. If they are used in essentially smaller proportions than has hitherto been usual with such assistants they improve the ailinity of the dyestufl in that there are obtained, for example, more vivid or fuller tints than without the assistant. The invention is particularly applicable in dyeing wool and silk, and valuable, even surprising, effects may be obtained with very diiferent dyestuffs. By their use the fastness to light of the dveings produced, particularly when using azo-dyestuffs, is also very often considerably im- 45 proved.

The process may consist in adding to the dyebath a small proportion, i. e. less than 1 per cent. calculated on the weight of the fiber to be dyed, of one of the aforesaid dispersing agents. As a rule quantities of 0.1 to 0.2 per cent will sumce. With certain dispersing agents or with certain dyestuffs it may also be of advantage to use more of the dispersing agent, for example 0.5 to 0.9 per cent.-

The invention may also be applied by mixing 55 a small proportion of one of the lyophile dispersing agents in question with the suitable dyestuif.

The dyestuif preparation thus obtained, when used in an acid dye-bath, yields the same effects as the dye-bath does when the assistant has been added to it. Similar effects may be obtained in printing. v

Among the dyestuffs in question are those known to dye in an acetic acid bath which belong to the groups of dyestuffs numbered as fol- 65 lows in Schultz, Farbstofitabellen, 7th edition, 1931, namely:120, 123, 247, 248, 298, 299, 300, 303, 552, 578, 588, 590, 591, 592, 594, 599, 600, etc.; also the more recent dyestuffs dyeing in an acid bath, such as those described in the following 7 German specifications, Nos. 270,831; 261,047; 286,091; 325,062; 398,792; 329,651 and French specification No. 479,998. The effects obtained are independent of the constitution of the dyestufi. 75 The following examples illustrate the invention able with dyestufis of the and show that valuable results are also obtaine, triphenylmethane and anthraquinone series; the parts are by weight:

Example 1 10 parts of wool are dyed in a bath consisting of 400 parts of water, 1 part of crystallized sodium sulfate, 0.4 part of acetic acid and 0.5 part of the dvestuff obtainable by coupling diazotized a-naphthylamine with l-hydroxynaphthalene- 8:6-disulfonic acid and 0.01 part of trimethylammonium-sulfate of m'ono-stearoylethylenediamine of the formula The operation consists in entering the goods at 60 C., heating the bath to boiling in the course of 1 hour and continuing the boiling for a further hour. There is obtained a red dyeing considerably more pure and deeper than is obtained without the addition of the stearoyl-ethylenediamino-derivative.

Example 2 10 parts of wool are dyed in a bath consisting of 400 parts of water, 1 part of crystallized sodium sulfate, 0.4 part of acetic acid and 0.05 part of the dyestufi obtainable by condensing 1 mol. benzaldehyde with 2 moles ethylbenzylaniline, sulfonating the condensation product, oxidizing the leuco-body and causing the latter to react with para-phenetidine and 0.01 part of the N- dihydroxypropylimidazole, obtainable by treating -heptadecylbenzimidazole with glycerinechlorhydrine of the formula OH CHPH-CHI-OH N/d-omm-ncn 100 parts of a finely powdered Standard black,

consisting of the black diazo-dyestufi obtainable by coupling in acid medium and then in alkaline medium 1 mol. of 4-nitrodiazobenzene and 1 mol. diazobenzene with 1 mo1.-of 1-amino-8-hydroxynaphthalene-3:6-disulfonic acid, of the Orange dyestufi No. 189, Schu1tz,-Farbstofitabellen 1931, 7th edition, and of the Red dyestufi No. 120, of the same Farbstofftabellen, are stirred in a convenient mixing vessel heated to 100 C., .and at the same time there is caused to flow gradually or there is sprayed into the vessel 20 parts of an alcoholic solution of 10 per cent. strength of the mixture of the hydrochlorides of N-dihydroxy-propylimidazoles, which is obtainable bf? treating with glycerine chlorhydrine the henzimidazole mixture highly alkylated at the carbon atom, which is itself produced by heating ortho-phenylene-diamine with hydrogenated fish oil.

There is obtained a dry dyestufi powder which dyes wool a strikingly fuller and deeper shade than is obtainable with the dyestuff which has not been treated in the foregoing manner.

Example 4 100 parts of finely powdered azo-dyestuff from diazotized l-amino-8-hydroxynaphthalene-3 6- disulfonic acid and l-phenylaminonaphthalene- 8-sulfonic acid are made into a paste, in a suitable mixing vessel capable of being heated, with 50 parts of alcohol; the paste is mixed with parts of an alcoholic solution containing 4 per cent. of phosphoric acid and 10 per cent. of the mixture of the hydrochlorides of the N-dihydroxypropyl-imidazoles, which is obtained by treating with glycerine chlorhydrine the mixture of benzimidazoles highly alkylated at the carbon atom, which is produced by heating orthophenylenediamine with a mixture of fats from hydrogenated fish oil, coconut oil and olive oil; the whole is then dried, while stirring, and powdered. The product is a dry dyestuff powder, which is not sticky; its dyeings on wool have a strikingly fuller and deeper shade than is produced by the parent dyestufl which has not been treated.

The procedure is similar with the other dyestuffs described in the introduction and in the examples. The compositions of matter of Examples 3 and 4 may vary with regard to their content of lyophile dispersing agent. As a rule it is advisable to use less than 10 per cent. of the weight of the dyestufi of the lyophile dip'ersing agent. Amounts which do not exceed 5 per cent. have proved particularly successful, as for example 5 per cent., 4 per cent., 3 per cent., 2 per cent. or 1 per cent. The amounts depend on the nature of the dyestufi.v

Example 5 A dye-bath for dyeing 10 parts of wool is prepared with 300 parts of water of 60 C., 0.4 part of acetic acid of 40 per cent. strength, 0.01 to 0.015 part of a mixture of N-hydroxy-alkylated imidazoles, obtained by causing a mixture of glycerine chlorhydrine and ethylene chlorhydrine to react on the imidazole which is itself formed by heating ortho-phenylene diamine with coconut oil, and a solution of 0.4 part of the dyestuff No. 300 of Schultz, Farbstofitabellen, 7th edition, 1931. The whole is then made up to 400 parts, the 10 parts of wetted wool are introduced and the bath heated to the boil within hour, whereupon feebly boiling is continued for 1 hour. In order to better exhaust the dye-bath there is added after a one hour's boil 0.1 part of sulfuric acid of 66 B. and dyeing is continued for a further 20 minutes. The wool is then thor; oughly rinsed and dried. There is obtained a deep black dyeing which is considerably deeper than the same dyeing dyed without addition of the auxiliary agent. The fastness to light of the dyeing is also considerably better than that of an equally strong dyeing produced without addition of the auxiliary agent.

What we claim is:-

1. 'A process for dyeing animal fibers with such acid wool dyestufls which are dyed in the first phase of the dyeing process in a bath rendered acid with acetic acid, consisting in adding to the dye-bath 0.1 to 0.2 per cent. of the weight of the wool to be dyed of a lyophile dispersing agent consisting of a lyophile salt of a benzimidazole substituted at the l-carbon atom by an open aliphatic chain consisting of at least 8 carbon atoms.

2. A process for dyeing animal fibers with such acid azo-dyestufis for wool which are dyed in the first phase of the dyeing process in a bath rendered acid with acetic acid, consisting in adding to the dye-bath 0.1 to 0.2 per cent. of the weight of thewool to be dyed of a lyophile dispersing agent consisting of a lyophile salt of a benzimidazole substituted at the i-ca-rbon atom by an open aliphatic chain consisting of at least 8 carbon atoms.

3. A process for dyeing animal fibers with such acid wool dyestufiswhich are dyed in the first phase of the dyeing process in a bath rendered acid with acetic acid, consisting in adding to the dye-bath 0.1 to 0.2 per cent. of the weight of the wool to be dyed of a lyophile dispersing agent consisting of a lyophile salt of an N-alkylated benzimidazole substituted at the a-carbon atom by an open aliphatic chain consisting of at least 8 carbon atoms.

4. A process for dyeing animal fibers with such acid azo-dyestuffs for wool which are dyed in the first phase of the dyeing process in a bath rendered acid with acetic acid. consisting in adding to the dye-bath 0.1 to 0.2 per cent. of the weight of the wool to be dyed of a lyophile dispersing agent consisting of a lyophile salt of an N-alkylated benzimidazole substituted at the a-carbon atom by open aliphatic chain consisting'of at least 8 carbon atoms.

5. A composition of matter,. characterized by a content of such an acid wool dyestufi which is dyed in the first phase of the dyeing process in a bath'rendered acid with acetic acid, and of at the most 5 per cent. of the weight of the dyestuff of a lyophile dispersing agent consisting of a lyophile salt of a benzimidazole substituted at the a-carbon atomby an open aliphatic chain consisting of at least 8 carbon'atoms. 6. A composition of matter, characterized by a content of such an acid azo-dyestufi for wool which is dyed in the first phase of the dyeing process in a bath rendered acid with acetic acid, and of at the most 5 per cent. of the weight of the dyestufl' of a lyophile dispersing agent, consisting of a lyophile salt of a benzimidazole substituted at the -carbon atom by an open aliphatic chain consisting of at least 8 carbon atoms.

7. ,A composition of matter, characterized by a content of such an acid azo-dyestufi for wool which is dyed in the first phase of the dyeing process in a bath rendered acid with acetic acid, and of at the most 5 per cent. of the weight of the dyestuff of a lyophile dispersing agent, consisting of a lyophile salt of an N-alkylated benzimidazole substituted at the -carbon atom by an open aliphatic chain consisting of at least 8 carbon atoms.

FRITZ STRAUB. FRITZ GRE'I'HER. CHARLES GRAENACHER. 

